public class Example3_6 {
  public static void main(String args[] ) {
   double sum=0,item =1;
   int i =1,n=20;
   while(i<n) {
    sum=sum+item;  
    i=i+1;
    item=item*(1.0/i);
   }
   System.out.println("sum="+sum);
}
}

